Projection apparatus



Dec. 10, 1929. K. BRENKERT ET AL 1,738,944

PROJECTION APPARATUS Filed Nov. 1, 1928 2 Sheets-Sheet 1 swewtoz Jr/fire Aer-7,

Q PW/ attomwa d 1386- 9- K. BRENKERT ET AL PROJECTION APPARATUS FiledNov. 1, 1928 2 Sheets-Sheet 2 Patented Dec. 10, 1929 tarts 9 insert rENrICE

PROJECTION APPARATUS Application filed November 1, 1928.

The present invention pertains to a novel projection apparatusconstructed particularly for use in theaters where a beam of llght s tobe projected upon a stage or screen.

.5 The projected beam of light is required to be directed to variousparts of the stage or screen at different times, and in the use of thepresent machines for projection, the operator is obliged to make arapidand hurried adjustment of the apparatus at the instant when thechange in the direction of the projection is required. Owing to theshort 1nterval of time in which the adjustment must be made, it is oftennecessary to use two mai5 chines, one of which is preset well inadvance; otherwise, if only one machine is used, there is likely to be adelay or interruption in the program.

The principal object of the present invention is to provide an apparatuspermitting an advance setting or adjustment for a future condition whilethe machine is in operatlon, so that the necessity for two machines isavoided. This object is accomplished by providing two projectingreflectors which are separately movable into the path of a beam of lightsuch as that picked up from a light source by a reflector. Only one proecting reflector at a time can occupy an operative po 0 sition in thebeam of light, and while one projecting reflector occupies suchoperative position,the other may be set for a future condition in theprogram. i

The invention is fully disclosed by way of example in the followingdescription and in the accompanying drawingsin which Figure 1 is a sideelevation of the apparatus;

Fig. 2 is a front elevation of the upper part thereof;

Fig. 3 is a detailed side elevation of the upper forward part; and IFig. 4. is a plan View of Fig. 3, with the refiector removed.

Reference to these views will now be made by useof like characters whichare employed to designate corresponding parts throughout.

The apparatus is built on a base 1 having tall uprights 2 at the rearcorners and short uprights ,3 at the forward corners. These Serial No.316,393.

uprights support a lower track structure 4 at substantially the upperend of the uprights 3. This structure extends forwardly of the uprights3 and carries at its forward ends a front frame member 5. The upper endsof the uprights 2 in conjunction with the memher 5 support another trackstructure 6 similar to the track 4. The tracks support light sources 7slidable thereon. Thetracks are provided with rack members 8 engageableby pinions (not shown) carried by the light Lsourcesand turned by meansof handles 9.

in like manner by the member 5, and both plates are provided withdissolving shutters 17 operated in the usual mannerby connecting linkage18 and a crank 19. Obviously, the members 5 and 10 are open in front ofthe frames 12 to permit light to pass there through and reachthedissolving shutters.

On the back side ofeach plate is pivotally mounted a lens frame 19carrying a plural ity of lenses 20 of different focal lengths andadapted to be brought separately into the beam emitted from therespective light source. The light sources may be adjusted on theirtracks to positions corresponding to the focal lengths of the severallenses, and each lens is accordingly used for a given position of thelight source. The operation and utility of this arrangement are fullydescribed in our copending application of even date.

The plate 15 carries a pair of brackets 21 to which-is secured areflector 22 overhanging the upper shutter 17 in such a manner as tointercept the beam of light issuing from the upper light source andtoreflect it downwardly. The projecting reflectors for picking up lightfrom the reflector 22 and throwing it upon the stage or screen areadjustably supported for the purpose which has already been indicatedand which will presently be described in detail. The slidable mountingfor such projecting reflectors includes lugs 23 formed at the lower endof the'plate 15 and a slide member 24 having rods 25 slidably receivedin the lugs 23. The slide assembly further includes brackets 26 securedto the member 24.

Each bracket is formed with a boss 27 which supports a yoke 28 by meansof a shaft 29 secured to the handle of the yoke and extending into thebearing27. To the lower end of the shaft, extending beneath the hearing27, is fastened a quadrant 30 having a toothed portion 315 and a slot32. A mirror or other projecting member 33 is pivoted between thebranches of the. yoke 28. The member 33 also carries a quadrant 35 atone edge thereof,'having a toothed portion 36 and a slot 37. From eachyoke extends an arm 38 in which is journaled a pinion 39 meshing withthe corresponding quadrant, whereby the mirror may be turned andadjusted on a horizontal axis. A locking screw 40 carried by the upperend of each yoke passes through the slot 37 of the adj acent quadrant35, whereby the position of the mirror may b secured.

In like manner, a pinion 41 is journaled in each of the brackets 26 andmeshes with the toothed portion 31 of the corresponding quadrant 30.Each of the latter quadrants is equipped with a locking screw 42 mountedin the bracket and passing-through the slot j 32 of' the quadrantwhereby the latter may be her 33 is idle.

locked in any position determined by the actuation of the screw 41. Itwill now be seen that each of the pinions 41 serves to swing thecorresponding yoke 28 and the projecting reflector 33 on a verticalaxis.

Each of the members 33' has an adjusting assembly similar tothatfdescribed, and a detailed section of only one is therefore deemedsufiicient. The relation of the members 33 -,to the reflector 22 is suchthat only one of the former may occupy a full operative position at atime, durlng WhlCll the remaining mem- The ldle member may be ad justedon either or' both of its aXesfor a different'projection angle which maybe necessary for a subsequent event in the program. When thisevent'occurs, the apparatus 1s caused to; project in the properdirection, merely'by. shifting the slide assembly by its knob 43toremove'the projecting reflector 33 previously in use, and tosubstitute the preset assemblyfin the path of the beam emitted by thereflector 22. 1

The lower forward member 5 is equipped with a similar assemblyconsisting of a single reflectorand a'pair of interchangeable andindependently adjustable projection reflectors. The lower assembly is,however, inverted with respect to the upper assembly, and it will beseen that the reflector 22 is at the lower portion of the plate whilethe slide lugs 23 are at the upper part of the plate. Otherwise, theconstruction and operation are similar to that described in connectionwith Figs. 2, 3 and 4.

The compactness of the device is further enhanced by mounting the effectholder 12 on a fixed support and behind the lens and mirrors. As aresult of this arrangement, the lens20 may easily be interchanged forthe purposes already described, and the direction of projection may bechanged without moving the effect holder.

' Although a specific embodiment of the invention has been illustratedand described, it will be understood that various alterations in thedetails of construction may be made without departing from the scope ofthe invention as indicated by the appended claims.

lVhat we claim is 1. A projection apparatus comprising a reflector, anda pair of projecting reflectors adapted to be moved selectively into andout of the path of said reflector.

2. A projection apparatus comprising a renector, and a pair ofprojecting reflectors adapted to be moved selectively into and out ofthe path of said reflector, and means for adjusting said projectingreflectors on their respective axes.

3. A projection apparatus comprising a reflector, a slide supported nearsaid reflector, and projecting reflectors carried by said slide andadapted to be moved selectively into the path of said reflector.

4. A projection apparatus comprising a reflector, a slide supported nearsaid reflector, and projecting reflectors carried by said slide andadapted to be moved selectively into the path of said reflector, andseparate means for adjusting said projecting reflectors on theirrespective axes.

5. A projection apparatus comprising a reflector, and a pair ofprojecting reflectors adapted to be moved selectively into and out ofthe path of said reflector, said projecting reflectors being separatelysupported for adjustment on both axes thereof.

6. A projection apparatus comprising a reflector, a slide supported nearsaid reflector, and projecting reflectors carried by said slide andadapted to be moved selectively into the path of said reflector, saidprojecting reflectors being separately supported for adjustment on bothaxes thereof.

projecting reflectors in said yokes, said projecting reflectors beingadapted to be moved respectively into the path of said reflector.

8. A projection apparatus comprising a reflector, a slide supported nearsaid reflector, and a pair of yokes pivotally supported by said slide,quadrants carried by said yoke, pinions rotatably mounted in said slideand engaging said quadrants, projecting reflectors pivotally mounted insaid yokes, means for securing the adjustment of said projectingreflectors in said yokes, said projecting reflectors being adapted to bemoved respectively into the path of said reflector.

9. A projection apparatus comprising a reflector, a slide supported nearsaid reflector, and a pair of yokes pivotally supported by said slide,means for securing said yokes in positions of pivotal adjustment,projecting reflectors pivotally mounted in said yokes, quadrants carriedby said projecting reflectors, pinions carried by said yokes and meshingwith said quadrants, said projecting reflectors being adapted to bemoved respectively into the path of said reflector.

10. A projection apparatus comprising a reflector, a slide supportednear said reflector, and a pair of yokes pivotally supported by saidslide, quadrants carried by said yokes, pinions rotatably mounted insaid slide and engaging said quadrants, projecting reflectors pivotallymounted in said yokes, quadrants carried by said projecting reflectors,pinions journaled in said yokes and meshing with said last namedquadrants, said projecting reflectors being adapted to be movedrespectively into the path of said reflector.

11. A projection apparatus comprising means for producing a beam oflight, and a pair of projecting reflectors adapted to be movedselectively into and out of the path of the beam produced by said means.

12. A projection apparatus comprising means for producing a beam oflight, and a pair of projecting reflectors adapted to be movedselectively into and out of the path of the beam produced by said means,and means for separately adjusting said projecting reflectors on theirrespective axes.

13. In a projection apparatus, a supporting member, an effect holder anda projection lens at opposite sides of said member, and a reflectorclose to said lens and adapted to receive light passing through saidholder and lens.

14k. in a projection apparatus, a support ing member, an eflect holderand a projection lens at opposite sides of said member, a reii ctorclose to said lens at the forward side 0' said supporting member andadapted to an d an adjustable projecting reflector id ipted to receivelight from said first named In testimony whereof We aflix oursignatures.

